“He was not speeding – just driving straight on as if he had not noticed there was a pedestrian crossing.

“I remember seeing [the boy’s] legs go up in the air – he landed on the front of the car, the car didn’t stop at that point.”

Jacqueline, the boy’s mum, said: “He was extremely upset at the time of the accident and thought he was having an extremely bad dream.

“He kept saying ‘I want to wake up’ – we were both in a state of shock.”

The accident closed Botley Road while police attended, causing gridlock across the city.

District Judge Malcolm Dodds said: “There is no dispute that a red light was clearly displayed and there is no dispute that there are pedestrians crossing on a red light.

“The accident speaks for itself. That is powerful evidence of dangerous driving because how on earth could a reasonable, competent and careful driver travelling down Botley Road not be really obviously aware of a pedestrian crossing, pedestrians on the crossing and the red light?

“This isn’t a case of ‘oops, oh dear’, using the brakes and coming to a stop: he carries on for quite a period of time and what appears to be a state of oblivion as to what is going on.

“That is incredibly powerful evidence to a driver falling well below the standard of what is expected of a careful and competent driver.”

Honoré, of Banbury Road, Oxford, is an honorary Q.C.who helped set up the Constitutional Court in South Africa in 1995.

His Wikipedia page says he has lived and taught in Oxford for the 55 years, including periods as a Fellow of The Queen’s College and New College.

He has honorary degrees from the Universities of South Africa, Stellenbosch and Cape Town and has written 13 books on law.

His defence said the incident was “the worst thing that happened to him in his life” and has taken a heavy toll.

Judge Dodds added: “He said this was worse than the injury he suffered in the war.

“There aren’t many people left who fought in the Second World War and I suspect he is one of the very few survivors of that battle.

“The accident was terribly traumatic [for Ragnar’s mother] and the only good thing is that Ragnar suffered miraculously few injuries.”

Despite Honoré denying the charge of dangerous driving, after the verdict Ragnar’s parents said that “justice had been done” and wished the professor well.